// 实现这个项目的构建任务，
//part2\fed-e-task-02-01\说明文档.txt为项目说明文档==============================================
const {src, dest, parallel, series, watch} = require('gulp')
const del = require('del')
const loadPlugins = require('gulp-load-plugins')
const browserSync = require('browser-sync')
const bs = browserSync.create()

const plugins = loadPlugins()

// const plugins.sass = require('gulp-sass')
// const plugins.babel = require('gulp-babel')
// const plugins.swig = require('gulp-swig')
// const plugins.imagemin = require('gulp-imagemin')

const clean = () => {
    return del(['dist','temp'])

}

const style = () => {
    return src('src/assets/styles/*.scss',{ base : 'src'})
    .pipe(plugins.sass({outputStyle:'expanded'}))
    .pipe(dest('temp'))
}

const script = () => {
    return src('src/assets/scripts/*.js',{base:'src'})
    .pipe(plugins.babel({presets:['@babel/preset-env']}))
    .pipe(dest('temp'))
}

const data = {
    menus: [
      {
        name: 'Home',
        icon: 'aperture',
        link: 'index.html'
      },
      {
        name: 'Features',
        link: 'features.html'
      },
      {
        name: 'About',
        link: 'about.html'
      },
      {
        name: 'Contact',
        link: '#',
        children: [
          {
            name: 'Twitter',
            link: 'https://twitter.com/w_zce'
          },
          {
            name: 'About',
            link: 'https://weibo.com/zceme'
          },
          {
            name: 'divider'
          },
          {
            name: 'About',
            link: 'https://github.com/zce'
          }
        ]
      }
    ],
    pkg: require('./package.json'),
    date: new Date()
  }

const page = ()=> {
    return src('src/*.html',{base: 'src'})
     .pipe(plugins.swig({ data, defaults: { cache: false } }))
     .pipe(dest('temp'))
}

const image = () => {
    return src('src/assets/images/**',{base: 'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = () => {
    return src('src/assets/fonts/**',{base: 'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = () => {
    return src('public/**',{base:'public'})
    .pipe(dest('dist'))
}

const serve = () => {
    watch('src/assets/styles/*.scss', style)
    watch('src/assets/scripts/*.js', script)
    watch('src/*.html', page)
    // watch('src/assets/images/**', image)
    // watch('src/assets/fonts/**', font)
    // watch('public/**', extra)
    watch([
      'src/assets/images/**',
      'src/assets/fonts/**',
      'public/**'
    ],bs.reload)

    bs.init({
        files:'temp/**',
        server:{
            baseDir:['temp','src','public'],
            routes:{
                '/node_modules': 'node_modules'
            }
        }
    })
}

const useref = () => {
  return src('temp/*.html')
  .pipe(plugins.useref({searchPath:['temp','.']}))
  .pipe(plugins.if(/\.js$/,plugins.uglify()))
  .pipe(plugins.if(/\.css$/,plugins.cleanCss()))
  .pipe(plugins.if(/\.html$/,plugins.htmlmin({
    collapseWhitespace: true,
    minifyCSS: true,
    minifyJS: true
  })))
  .pipe(dest('dist'))
}

const compile = parallel(style,script,page)

const build = series(clean,parallel(series(compile,useref),image,font,extra))

const develop = series(compile,serve)

module.exports = {
    clean,
    develop,
    build
}

